Which of the following statements are correct? I. The frequency (nu) and wavelen

Question

Which of the following statements are correct? I. The frequency (nu) and wavelength (lambda) of electromagnetic radiation are inversely related II. Electromagnetic radiation has properties of both waves and particles III. The energy (E) of electromagnetic radiation is inversely related to frequency (nu) IV. Electrons have properties of both waves and particles A. None of the statements are correct B. I and II only C. I, II and III only D. I, II, III and IV E. I, II and IV only Which one of the following statements is correct? A. Both the energy and location of an electron in an atom can be described precisely B. Neither the energy nor location of an electron in an atom can be described precisely C. The energy of an electron in an atom can be described precisely, but its location can only be described in terms of probability D. The location of an electron in an atom can be described precisely, but its energy can only be described in terms of probability E. None of the above statements are correct Which one of the following statements is incorrect? A. A maximum of 2 electrons can occupy an s orbital B. A 4d orbital is higher in energy than a 3d orbital C. Orbitals that have the same energy are termed degenerate D. The p orbitals within an electron shell have different energy E. Increasing value of principle quantum number represents increasing orbital size Which one of the following statements about an electron shell with n = 3 is correct? A. There are 9 subshells within this shell B. There are 9 orbitals within this shell C. A maximum of 8 electrons can occupy this shell D. The shell only has s and p orbitals E. None of the above statements are correct

Explanation / Answer

1.For electromagnetic radiation C=lv where c is speed of radiation ,l Is the wavelength and v is frequency

So frequency is inversely proportional to wavelength. Electromagnetic radiation has both wave and particle properties.

Energy of electromagnetic radiation is guven by hv where h is planck's constant and v is frequency. Thus energy is proportional to frequency.

Elecrrons show both wave and particle nature which can shown by photoelectric effect and hydrogen emissions respectively.

Option E is correct.

2.energy of electron can easily be determined precisely using bohr by exciting It from ground to higher state

But location cannot be describd precisely ony its probablity can be predicted of finding the electron.

Otion C is correct.

3.s orbitals can have maximum of 2 electrons

According to Aufbau principle of writing electronic configuration ,3d is filled first due to lower energy and then is filled in order of increasing energy.

Orbitals having same energy level are degenrate.(c is wrong)

Each orbital has different energy within an electronic shell.

As n increases size of orbital increases.

4.when n=3

Allowed orbitals are 3s,3p and 3d

So total subshells=1+3+5=9

No of orbitals =3(s,p and d)

Max electrons=2+6+10=18 electrons.

Option A is correct.

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